Liquid Detector; Flow Mode Sampling; Enable Pin - Teledyne 4700 Installation And Operation Manual

3.3.4 Liquid Detector

SELECT OPTION: (<-->)
LIQUID DETECTOR
USE LIQUID DETECTOR?
YES NO
__ RINSE CYCLES
(0-3)
RETRY UP TO ___ TIMES
WHEN SAMPLING (0-3)

3.3.5 Flow Mode Sampling

SELECT OPTION: (<-->)
FLOW MODE SAMPLING
SAMPLE AT START?
YES NO

3.3.6 Enable Pin

SELECT OPTION: (<-->)
ENABLE PIN
Select this option to turn liquid detection on or off. This setting
also allows you to configure suction line rinses and sample
retries.
1. Select the LIQUID DETECTOR option and press Enter.
2. Select YES (the factory default) for improved sample vol-
ume accuracy, and to enable Rinse Cycles and Sampling
Retries. Select NO to turn off all of these features and
return to the SELECT OPTION <- -> screen.
3. Press a Number button to specify how many rinse cycles
should be performed before collecting a sample.
4. If the sampler fails to detect liquid, it can try again to col-
lect the sample. Press a Number button to specify how
many retries the sampler should attempt.
For most sampling applications you should use Liquid Detection.
Selecting NO may adversely affect sample volume repeatability
and will turn off Rinse Cycles and Sampling Retries.
You can use Rinse Cycles to condition the suction line and
strainer before collecting a sample. Rinse Cycles may also
improve sample volume repeatability by ensuring the suction
line is wetted before each sample. One rinse cycle draws liquid
through the suction line until it reaches the Liquid Detector.
Then, the pump reverses direction and to clear the suction line.
Note that Rinse Cycles add to the Pump Counts (section 3.3.9)
and requires more frequent pump tube changes.
Select this option to indicate whether or not the sampler should
take a sample when the Run Program button is pressed. The
Sample At Start option is only applicable to Flow Paced pro-
grams.
1. Select the FLOW MODE SAMPLING option and press
Enter.
2. Select YES to take the first sample when the start time is
reached. Select NO to wait until the flow count triggers the
first sample.
If you select YES, when you run the program the sampler takes
the first sample immediately (if NO DELAY TO START, see section
3.5.18) and starts counting flow pulses for the next interval.
Select this option to specify which actions the sampler controller
should take when the Enable Pin state changes. The Enable Pin
feature allows an external device (section 2.8) to control the
running programs.
1. Select the ENABLE PIN option and press Enter.
Isco 4700 Refrigerated Sampler
Section 3 Programming
3-5